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Hi, thanks for writing in. Code P2101 is titled Throttle Actuator Control Motor Circuit Performance. Instead of using a traditional throttle cable, your vehicle uses an electronic throttle control. In this system, the throttle control module receives input from sensors, such as the accelerator position sensor. It then uses this information to control the throttle using a stepper motor. The code you have indicates a problem somewhere in this system. It could be anything from a wiring issue to a failed throttle control module. I recommend having a professional, such as one from YourMechanic, diagnose and repair this problem for you.

Q: Blown head gasket?

Hi, thanks for writing in. Unfortunately, white smoke in the exhaust, overheating and rough running all point to engine coolant getting into the combustion chamber. This is generally caused by a crack in the head or block or more commonly...

Q: HID Bulbs

Hey there. BMW's use a specific color temperature for HID bulbs. Aftermarket D2S bulbs will work, but won't match 100% in regards to color. If you're going to use an aftermarket D2S bulb, replace both so they will match. Be...

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